Vilha Intressenter Ab Notifies Ahlstrom Corporation That Shares Exceed 5%

Helsinki, Finland, 29 April 2008 -- Pursuant to Chapter 2, Section 9, of the Securities Market Act, Ahlstrom Corporation has received an announcement from Vilha Intressenter Ab dated 28 April 2008 regarding a change in the shareholding of said shareholder.

According to the announcement, Vilha Intressenter Ab's shareholding in Ahlstrom Corporation has on 28 April 2008 exceeded 5% (1/20) of the share capital and voting rights of Ahlstrom Corporation. Vilha Intressenter Ab now owns 2,336,312 shares of Ahlstrom Corporation, which represent 5.01% of the share capital and voting rights of Ahlstrom Corporation.

Ahlstrom's share capital consists of 46,670,608 shares, each entitling to one vote.

Ahlstrom is a global leader in the development, manufacture, and marketing of high performance fiber-based materials. Nonwovens and specialty papers, made by Ahlstrom, are used in a large variety of everyday products, such as filters, wipes, flooring, labels, and tapes. Ahlstrom's 6500 employees serve customers via sales offices and production facilities in more than 20 countries on six continents. In 2007, Ahlstrom's net sales amounted to EUR 1.8 billion. Ahlstrom's share is listed on the OMX Nordic Exchange Helsinki. The company Web site is